HTML Preview
Paste or write HTML and watch it render live in a sandboxed frame. Open the result full-page, download it as a .html file, or share it with a link. All local — your code never leaves the browser.
Code
Preview
What you can do next
FAQ
Is my code uploaded anywhere?
No. Rendering happens entirely in your browser inside a sandboxed iframe. Share links encode the code in the URL fragment (after #), which browsers never send to any server.
Can the previewed page access my Pocketful data?
No. The preview iframe is sandboxed on an isolated origin: its scripts cannot read this site's storage or cookies, open popups, or navigate the top page. It can only affect itself.
Why did auto-preview pause on a large document?
Beyond roughly 300 KB of code, re-rendering on every keystroke would stutter. Auto-render pauses and the Run button takes over — press it whenever you want to refresh the preview.
Can I use external CSS or JavaScript from CDNs?
Yes. Anything a normal web page can load — stylesheets, scripts, fonts, images — works in the preview as long as you are online.